What Is Uva And Uvb Light Spectrum

According to multiple sources nasa fda and others here are the wavelengths of the uva uvb and uvc regions.

What is uva and uvb light spectrum.

Uv b light does not tan the skin very much compared to the uv a lamps that are used in tanning beds. Frequency speed of light. Uvb rays are responsible for producing sunburn. The uv spectrum is broken up into three parts.

This spectrum is also commonly called the biological spectrum due to the human body s sensitivity to light of such a wavelength. Uva light helps regulate behaviors such as feeding diurnal movement mating and similar activities. The amount of uvb rays that we are exposed to varies depending on the season and the time of the day. Broad spectrum has become a popular label in sunscreens in recent years.

The rays that are most damaging to our skin are called ultraviolet uv rays. Uvb light allows the synthesis of vitamin d3 which helps to absorb calcium. Uvb in the range of 290 320nm are short waves of solar rays. There are two basic types of ultraviolet rays that reach the earth s surface uvb and uva.

Uvb rays make up just about 5 of the uv rays that reach the earth 4 and are strongest during the summer especially from 10am to 2pm. All three of these types of light are found in natural sunlight. Uvc 290 nm 100 nm. Light falls between microwaves and x rays on the electromagnetic spectrum and is further broken down into infrared visible light and ultraviolet.

There are three types of ultraviolet radiation two of which are important to reptiles. These are uva which has the largest wavelenth and uvb. Uvb 320 nm 290 nm. Calculated uva and uvb light transmission values and percent blocking values from the example spectra shown in figure 1.

Uva 400 nm 320 nm. Unlike uva rays uvb rays cannot penetrate clouds and glass but they can penetrate into the epidermis. This label is a statement that the sunscreen protects the user from both uva and uvb rays. While uva and uvb rays differ in how they affect the skin they both do harm.

There are many different types of rays present in sunlight. The uva spectrum is just below the visible spectrum with a wavelength range of 315 to 400 nm. Ultraviolet a uva has a longer wavelength and is associated with skin aging. Uv b lamps are lamps that emit a spectrum of ultraviolet light with wavelengths ranging from 290 320 nanometers.

Nm means nanometer 400 nm 400 x 10 9 meters or 0 0000004 meters as far as the frequency is concerned i will let you do the math. Two types of uv light are proven to contribute to the risk for skin cancer. Ultraviolet b uvb has a shorter wavelength and is associated with skin burning.